SDL2InputDevice provides a new UE4 input device that utilizes the Simple DirectMedia Layer (SDL2) library. This device can then be used to access or provide more advanced functionality than what is available in the engine by default. It was designed from the start to be as transparent to UE4 as possible. 

SDL2InputDevice is as its namesake suggests a new input device. This solution means that input is passed into the various game systems of UE4 through the existing input pipeline. With SDL2InputDevice, there is no need for hacky blueprint glue code or special processing